Malicious PDF — malware analysis report

Static analysis result for SHA-256 684c949c00737727…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 10:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 025e41f88777289296e2ac03541b06fc SHA-1: b9456ad13e229eb105648ca73a46132690a7347c SHA-256: 684c949c00737727351d324ac95523c14e3f399d0f265d550c8925f2e26fe1bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=aplicacion+para+descargar+video+de+youtube+para+android PDF link annotation
    • https://gameclub.by/uploads/files/95297608966.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/61566542896.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210912221810.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/jetidaloziguga.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e126a9b281---7059790948.pdfIn PDF document text
    • http://ustunongel.com/image/files/baromokerewebavoruze.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/34710820490.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f661030426fccc869c9501c9be7d873a/nebid.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/rakixil.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/49905024639.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/24748970838.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/81460724992.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/jegun.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/71909665550.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lugewifizep.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88811102710.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/xejawogarivifipigesebup.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/xopojokibutadofuwedek.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/34150219079.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/75777993397.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/fosigujuxebudubutosope.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/terovojexu.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/32375663652.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/jekore.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/puluweparukixusezemuvexew.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/27802605245.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/lodimigesodebapurofid.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/53245759437.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 11092 bytes
SHA-256: 185e423b1484ee2f3d74f6766705206c90053d20053f150c9b1375a1f631319c
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 19176 bytes
SHA-256: c6998d004547d2a8f51f3465e7e8b426151ce62a01e4d702af795aacd0abf592